Telephone Hybrids - DHY-04

    • Auto-sensing combined analogue or AES/EBU XLR input.
    • AES/EBU sample rates up to 24 bit/96kHz accepted.
    • Configurable analogue or AES/EBU XLR output.
    • Ethernet port for remote configuration via web browser GUI.
    • Remote dialling and line hold control via Ethernet.
    • Ethernet network interface can generate SNMP Traps for SNMP management systems.
    • DTMF dial tone recognition for reporter remote access - a journalist can dial into the unit which can recognise a pre-programmed DTMF numeric password to automatically connect the journalist on-air.
    • Four front panel speed-dial buttons for dialling internally preset phone numbers.
    • Front panel Redial button for redialling the last number.

    The DHY-04T 1U rackmount twin telephone hybrid is an enhanced redesign of the DHY-03 , the best performing telephone hybrid in the world. It now has auto-sensing combined analogue and AES/EBU inputs and outputs, front panel speed dial buttons, together with an Ethernet interface to allow web browser access to the configuration and internal settings. All whilst still retaining stunning line balance rejection figures. For the best sounding audio calls you’re likely to hear, you should specify the DHY-04.

    Technical Specification For DHY-04T

    Audio Specification


    Analogue Audio I/O

    Input Impedance - Line Mode (Clean Feed): 10kΩ balanced 0dB
    Input Impedance - Conferencing: 10kΩ balanced 0dB
    Input Impedance - Microphone Mode: 2kΩ balanced
    Input Level Gain Range: +6dB, 0dB, and -6dB adjusted by 3-position front panel switch, +10dB jumper
    Microphone Level Gain Preset: From 65dB to 35dB
    Maximum Input Levels: Line +26dBu, mic -24dBu
    Clean Feed Limiting Input: -4dBu for CTR21 setting, other values available *
    Output Impedance - Line Out: 50Ω balanced floating 0dBu
    Output Impedance - Conference/Record: 50Ω balanced floating 0dBu
    Output Level Gain Range: +6db, 0dB, and -6dB adjusted by 3-position front panel switch

    Digital Audio I/O

    Input Impedance: 110Ω ±20% balanced
    Output Impedance: 110Ω ±20% balanced
    Sample Frequency Range: 30 - 100kHz (i.e. including 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz & 96kHz)
    Signal Level: 2V/7V peak to peak min/max
    Analogue Input Level for Full Scale Digits: +18dBU

    Telephone Line

    Bandwidth to Telephone Line: 250Hz - 4kHz, -3dB ref 1kHz
    Telephone Line Impedance: 600Ω, 900Ω plus 14 other complex impedance circuits *
    Rejection Ratio: 80-88dB on complex waveforms, reference peak level of 0dBFS
    Ring Detector Sensitivity: Off, 2, 4 or 6 rings

    Power Supply

    Power to DHY-04, S & T Universal 12W power supply: 90 to 250V AC; 47-63Hz; fused 1A
    * These values are dependent on the actual country setting selected on the DHY-04


    Mic/Line/AES-EBU Input: XLR 3 pin female, with push-button mic/line selection
    Line/AES-EBU Output: XLR 3 pin male
    Telephone Line: RJ11 6/4 socket
    Telephone Handset/Instrument: RJ11 6/4 socket
    Conferencing or Record Audio: RJ45 socket
    Remotes: 9-way D-type socket
    Ethernet: RJ45 socket
    RS232 Serial: 9-way D-type socket
    Power: IEC mains (CEE22)

    Get in touch

    • Media Links HEAD OFFICE
    • Room # M-1, Mezzanine Floor
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      Tel: (+92-21) 34385038-39
      Fax: (+92-21)34390630
    • Media Links ISLAMABAD
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      Maain Muree Road Rawalpindi- Pakistan
      Tel: (+92-51) 4575287-88
      Fax: (+92-51) 8311191
    • Media Links LAHORE
    • First floor Plaza #7
      Cavalry Ground
      Lahore-Cantt, Pakistan
      Tel: (+92-42) 36610212 & 36673148
      Fax: (+92-42) 36673149
    • Media Links SADDAR KARACHI
    • SHOP NO 25
      ELahi Centre Preedy Street
      Saddar, Karachi, Pakistan
      Tel: 021-32752512
      Fax: (+92-42) 36673149

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